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C. DOR'IOT. DENTAL PLUeeBR.

(No Medel.)

Patented Sept. 5,1898.

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UNITED STATES PATENT OFFICE CONSTANT DORIOT, F PHILADELPHIA,PENNSYLVANIA, ASSIGNOR TO 'THE S. S. WHITE DENTAL MANUFACTURING COMPANY,OF SAME PLACE.

DENTAL PLUGGER.

SPECIFICATION forming part of Letters Patent No. 504,489, datedSeptember 5, 1893.

Application led March 9, 1893. Serial No. 465,283. (No model.)

To a/ZZ whom it may concern,.-

Be it known that I, CONSTANT DoRIor, a citizen of the Republic ofFrance, residing in thel city of Philadelphia, in the county ofPhiladelphia and State of Pennsylvania, have invented certain new anduseful Improvements in Dental Pluggers, of which the folportions of theplugger.

lowing is a specication.

My invention relates to certain improvements, as Jhereinafterspecifically claimed, in automatic dental pluggers of the revolvinghammer class.

In the accompanying drawings which show a suitable embodiment of myimprovements, Figures 1 and 2 are views in elevation at right angleswith each other. Fig. 3 is a view mainly in longitudinal centralsection, some parts being in elevation. Fig. 4 is a longitudinal centralsection as indicated by the line 4 of Fig. 7 at a right angle with Fig.3 of Fig. 5 is a view of the rotary hammer, with its side plate or coverremoved. Fig. 6 is a similar view, showing a hammer diering somewhatfrom that shown by Fig. 5. Fig. 7 is a section on an enlarged scale onthe line 7 of Fig. 2. Fig. 8 is a sec-v tion, enlarged, on the line 8'ofFig. 9, representing a modiiication, and Fig. 9 a section, on a reducedscale, on the line 9 of Fig. 8, the plunger and hand-piece casing beingomitted.

In the organization shown the rotary hammer A of the plugger is adaptedto be operated by a driving cord passing about a pulley A on the shafta, of the hammer. The plugger is adapted for connection with the forearmor outer section of an engine arm of suitable well known construction,which is to be engaged with the socket b and spring catch b of theconnecting arm B so that this arm may turn freely about the engine arm.The connecting arm is connected to a yoke coupling C which has pivotedconnection by way of the hammer shaftawith the plugger frame D. Bushingsleeves d CZ screwed into the plugger frame constitute bearings in whichthe hammer shaft rotates and also serve as journals for pivotallyconnecting the yoke coupling with the plugger frame. See Fig. 3. A setscrewr c serves to fasten the revolving hammer to its shaft. The pulleyA is protected by a hinged shield or open-top coverE engaging with thecatch e. This shield serves as a guard to prevent the driving cord fromrunning off the pulley. The pulley, it should be noticed, is mountedoutside the plugger frame D and coupling .frame C, so as to be readilyaccessible when the inclosing shield is swung on its hinged connectionwith the coupling frame. A reciprocating, split-ended plunger Fin whichthe plugger point f isclamped by a nut F" which serves as a finger rest,has suitable bearing in .the hand-piece casing H and in the sleeve D ofthe plugger frame. The casing is connected with the frame sleeve so asto turn freely, by means of asegmental piece or section of a ring hfitting so as to turn in an annular groove in the sleeve and secured tothe casing bya screw h. See Figs. 3 and l.

An adjustable spring controlling arm I by means of which to regulate thelength of stroke of the plunger and consequently the force of the blowsstruck by the pl ugger point, is provided as follows:-' he controllingarm I is provided at one end with screw threads c', has a lug J near itsscrew-threaded end which passes through slots in the casing and plunger,and near its outer or free end is provided with a second lug K which isinclined on its outer or front edge and enters a slot in the plungerwhich is shouldered to provide a projection k which by contact with thelug limits inward movement of the plunger.

The casing is provided with a longitudinal recess L constituting a seatto receive the controlling arm at and near its rear end, and islongitudinally slotted at Z in line with the recess to allow ofthedepression of theouter end of the arm. This controlling arm is renderedadjustable in the following wayz-An internally threaded adjusting sleeveMitting about the hand-piece casing in rear of an annular shoulder 'mthereon against which the sleeve abuts, engages the threaded end of thearm and serves to advance or retract it, as desired, to vary the endwisemovement allowed the plunger. To prevent accidental turning of theadjusting sleeve it is provided at its rear end with serrations orV-shaped teeth which are engaged by a spring pawl In, to yieldingly lockthe sleeve against turning. This pawl is secured to the rear end of theICO hand piece casing by means of a screw n and by being engaged with arecess in a collar O secured by a screw c to the rear end ot the casing.The pawl yields readily enough t0 allow of the adjusting sleeve beingturned as desired.

Instead of the projection 7c in the plunger slot this slotmay have aninclined front or rear wall as indicated by dotted lines Fig. 4, to beacted upon by the controlling arm lug K, and the incline of this lug beomitted. It will be seen that were the controlling arm terminated at itslug J there would still be provision for varying the throw or length ofstroke of the plunger, as this lug is rendered adjustable in its slot inthe plunger by the adjusting sleeve of the controlling arm.

An adjustable collar P turns on the nose end of the hand piece casingbetween an annular shoulderp and a collar p suitably Fixed in place, asby soldering. The adjustable collar has a recess or slot q formed in itcorresponding in width with the slot Z in the hand-piece casing. Theslot q may be brought in line with the hand-piece slot by adjustment ofthe collar P, so that the end of the controlling arm beyond its stop lug maybe depressed into this slot q. See Figs. 2, land 7 The adj ustahlecollarhas an annular internal shoulder at s thus producing an annularrecess s. See Figs. 3 and 7. Three slots t are made through the recessedportion of the collar, and this collar is formed with a projecting orthickened portion T at one side of its slot. A spring locking catch Usecured by a screw u to the hand-piece casing extends at its free endinto the annular recess s of the adjustable collar, and has an inclinedrib@ adapted to be sprung into any one of `the slots t with which it maybe brought to register by the turning of the collar. See Figs. 4 and 7.The catch may readily be depressed by the finger to disengage its ribfrom the collar to permit the latter to be turned; or the collar may beturned by the application of sufiicient force without pressing upon thecatch with the iinger, the inclination ot' the rib being such that thewalls of the collar slots when firmly pressed against it will force itout of locking engagement with the collar.

The revolving hammer A is provided with a spring-actuated tappet Vwhichmay either be a ball or cylindrical roller. The tappet (see Figs. 5 and6) rolls in its bearing socket in the hammer thereby lessening frictionand reducing wear, while insuring a smoother or less jarring blow uponthe plunger than that struck by a tappet such asl ordinarily used. Thetappet-actuatin g spring V may be of any Suitable kind. In Fig. 5 it isshown as curved or bowed, being secured in place by a projection at oneend entering a recess in the hammer, and bearing upon the roller tappetnear its opposite end. Fig. 6 shows a bow spring having anti-frictionrollers at its free end for bearing upon the tappet. The side plate c ofthe hammer, secured in place by screws, serves to prevent displacementof the parts and protects them from dust, dac.

From the above description it will be seen that with the parts in theposition in which they are represented in Figs. l, 2, 4E and 7, with theadjusting sleeve M properly set to bring the lug K of the controllingarm into desired position relatively to the projection 7.o of theplunger, (or the inclined wall of the plunger slot in lieu ot thisprojection) the operation wll be as followsz-The plugger point beingheld against or in close proximity to the filling to be compacted, andthe rotary hammer in motion, the tappet strikes blows in rapidsuccession upon the plunger, and the force of the blows may be governedby depressing the controlling arm more or less so as to vary the amountof play allowed the plunger to the desired extent. When it is desired tolimit the amount of play allowed the controlling arm the adjustablecollar P is turned to move its slot out of line with the slot in thehand piece casing and bring beneath the end of the arm that portion ofthe collar at the side of its slot opposite its projecting or thickenedportion, in which position the collar is locked bythe catch U which nowengages with a slot t of the adjustable collar at one side of the slotwith which it before engaged. Only slight variation in the force of theblow by manipulation of the controlling arm is allowed with the parts inthis position as the extent to which the controlling arm maybe pressedinward is limited by contactot its free end with the collar. Vhen it isdesired to dispense with the actuation of the controlling arm to varythe blow, the adj ustable collar is turned and locked by its catch inposition to present the projecting portion of the collar beneath the armend, and thereby prevent its depression.

In the construction shown in Figs. 9 and 10, the locking catch U isreplacedby aspring locking catch W, and in place of the recessedadjustable collar P there is used a cam-shaped or eccentric turningcollar W provided with V-shaped notches in its outer surface. Thecontrolling arm is threaded as before 'to be acted upon by the adjustingsleeve M and the lug J of the arm extends through the handpiece casingand is detachably connected by a screw m with the spring locking catchW. It will be seen that by turning the adjustable collar W the lug K ofthe controlling arm may be set to vary the play allowed the plunger,thus altering the force of the blows struck by the hammer as willreadily be understood.

I claim as my invention l. The combination of the hand-piece casing, theslotted plunger therein, the controlling arm provided with the lug orlugs for acting on the plunger, and the adjusting sleeve for impartingendwise movement to the controlling arm, substantially as set forth.

2. The combination of the hand-piece cas- IOO IIO

ing, the slotted plunger, its lugged controlling arm, the adjustingsleeve toothed or serrated at its end, and the spring pawl yieldinglylocking the adjusting sleeve against movement, substantially as setforth.

3. The combination of the hand-piece casing, the slotted plunger, itslugged controlling arm, the adjustable collar turning about the nose endof the hand-piece casing for limiting movement of the controlling arm,and the spring locking catch for securing the adjustable collar in itsadjusted position, substantially as and for the purpose set forth.

4. The combination, in a dental plugger, of the revolving hammer, theroller tappet there- CONSTANT DORIOT.

Witnesses:

ROBT. S. GORDON, GEORGE I. MORGAN.

